Title: Optimisation of first generation crone approximated fractional-order PIλDμ controller by using charged system search

Authors: O. Tolga Altinoz; A. Egemen Yilmaz; Gerhard-Wilhelm Weber

Addresses: Department of Electrical and Electronics Engineering, Ankara University, 50.Yil Yerleskesi, 06830 Golbasi, Ankara, Turkey ' Department of Electrical and Electronics Engineering, Ankara University, 50.Yil Yerleskesi, 06830 Golbasi, Ankara, Turkey ' Institute of Applied Mathematics, Middle East Technical University, Dumlupinar Blv., 06800 Cankaya, Ankara, Turkey

Abstract: Fractional-order proportional-integral-derivative (PIλDμ) controllers can provide better performance than conventional PID controllers because of two additional parameters, which makes the design more flexible. However, these additional parameters make the tuning of controllers harder. It needs additional attention/tools for a proper/desired performance. Therefore, in this study, tuning of fractional order PID controller is converted to an optimisation problem, and it is solved by using charged system search (CSS). Test plants are defined to compare the output response of the delayed system for different orders. In addition, the performance of the system is evaluated/compared by optimising with the CSS and particle swarm optimisation (PSO). The comparison between these two algorithms is performed based on the time response (transient response) properties of each system. The results show that the CCS optimised systems outperform against PSO optimised systems for non-delayed plants; in case of delay in the systems, the PSO presents better performance.

Keywords: CSS; charged system search; optimisation; fractional-order PID.

DOI: 10.1504/IJISTA.2017.084226

International Journal of Intelligent Systems Technologies and Applications, 2017 Vol.16 No.2, pp.127 - 139

Received: 13 Nov 2015
Accepted: 14 Sep 2016
Published online: 21 May 2017 *

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